volk_32f_s32f_power_32f.h

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/* -*- c++ -*- */
/*
 * Copyright 2012, 2014 Free Software Foundation, Inc.
 *
 * This file is part of VOLK
 *
 * SPDX-License-Identifier: LGPL-3.0-or-later
 */
 
#ifndef INCLUDED_volk_32f_s32f_power_32f_a_H
#define INCLUDED_volk_32f_s32f_power_32f_a_H
 
#include <inttypes.h>
#include <math.h>
#include <stdio.h>
 
#ifdef LV_HAVE_SSE4_1
#include <tmmintrin.h>
 
#ifdef LV_HAVE_LIB_SIMDMATH
#include <simdmath.h>
#endif /* LV_HAVE_LIB_SIMDMATH */
 
static inline void volk_32f_s32f_power_32f_a_sse4_1(float* cVector,
                                                    const float* aVector,
                                                    const float power,
                                                    unsigned int num_points)
{
    unsigned int number = 0;
 
    float* cPtr = cVector;
    const float* aPtr = aVector;
 
#ifdef LV_HAVE_LIB_SIMDMATH
    const unsigned int quarterPoints = num_points / 4;
    __m128 vPower = _mm_set_ps1(power);
    __m128 zeroValue = _mm_setzero_ps();
    __m128 signMask;
    __m128 negatedValues;
    __m128 negativeOneToPower = _mm_set_ps1(powf(-1, power));
    __m128 onesMask = _mm_set_ps1(1);
 
    __m128 aVal, cVal;
    for (; number < quarterPoints; number++) {
 
        aVal = _mm_load_ps(aPtr);
        signMask = _mm_cmplt_ps(aVal, zeroValue);
        negatedValues = _mm_sub_ps(zeroValue, aVal);
        aVal = _mm_blendv_ps(aVal, negatedValues, signMask);
 
        // powf4 doesn't support negative values in the base, so we mask them off and then
        // apply the negative after
        cVal = powf4(aVal, vPower); // Takes each input value to the specified power
 
        cVal = _mm_mul_ps(_mm_blendv_ps(onesMask, negativeOneToPower, signMask), cVal);
 
        _mm_store_ps(cPtr, cVal); // Store the results back into the C container
 
        aPtr += 4;
        cPtr += 4;
    }
 
    number = quarterPoints * 4;
#endif /* LV_HAVE_LIB_SIMDMATH */
 
    for (; number < num_points; number++) {
        *cPtr++ = powf((*aPtr++), power);
    }
}
 
#endif /* LV_HAVE_SSE4_1 */
 
 
#ifdef LV_HAVE_SSE
#include <xmmintrin.h>
 
#ifdef LV_HAVE_LIB_SIMDMATH
#include <simdmath.h>
#endif /* LV_HAVE_LIB_SIMDMATH */
 
static inline void volk_32f_s32f_power_32f_a_sse(float* cVector,
                                                 const float* aVector,
                                                 const float power,
                                                 unsigned int num_points)
{
    unsigned int number = 0;
 
    float* cPtr = cVector;
    const float* aPtr = aVector;
 
#ifdef LV_HAVE_LIB_SIMDMATH
    const unsigned int quarterPoints = num_points / 4;
    __m128 vPower = _mm_set_ps1(power);
    __m128 zeroValue = _mm_setzero_ps();
    __m128 signMask;
    __m128 negatedValues;
    __m128 negativeOneToPower = _mm_set_ps1(powf(-1, power));
    __m128 onesMask = _mm_set_ps1(1);
 
    __m128 aVal, cVal;
    for (; number < quarterPoints; number++) {
 
        aVal = _mm_load_ps(aPtr);
        signMask = _mm_cmplt_ps(aVal, zeroValue);
        negatedValues = _mm_sub_ps(zeroValue, aVal);
        aVal =
            _mm_or_ps(_mm_andnot_ps(signMask, aVal), _mm_and_ps(signMask, negatedValues));
 
        // powf4 doesn't support negative values in the base, so we mask them off and then
        // apply the negative after
        cVal = powf4(aVal, vPower); // Takes each input value to the specified power
 
        cVal = _mm_mul_ps(_mm_or_ps(_mm_andnot_ps(signMask, onesMask),
                                    _mm_and_ps(signMask, negativeOneToPower)),
                          cVal);
 
        _mm_store_ps(cPtr, cVal); // Store the results back into the C container
 
        aPtr += 4;
        cPtr += 4;
    }
 
    number = quarterPoints * 4;
#endif /* LV_HAVE_LIB_SIMDMATH */
 
    for (; number < num_points; number++) {
        *cPtr++ = powf((*aPtr++), power);
    }
}
 
#endif /* LV_HAVE_SSE */
 
 
#ifdef LV_HAVE_GENERIC
 
static inline void volk_32f_s32f_power_32f_generic(float* cVector,
                                                   const float* aVector,
                                                   const float power,
                                                   unsigned int num_points)
{
    float* cPtr = cVector;
    const float* aPtr = aVector;
    unsigned int number = 0;
 
    for (number = 0; number < num_points; number++) {
        *cPtr++ = powf((*aPtr++), power);
    }
}
#endif /* LV_HAVE_GENERIC */
 
 
#endif /* INCLUDED_volk_32f_s32f_power_32f_a_H */